This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 1 | 64 |
| 2 | 1984 |
| 3 | 23232 |
| 4 | 153824 |
| 5 | 724352 |
| 6 | 2661504 |
| 7 | 8208640 |
| 8 | 22114304 |
| 9 | 53570368 |
| 10 | 119129856 |
| 11 | 246971072 |
| 12 | 482429024 |
| 13 | 896290944 |
| 14 | 1594476160 |
| 15 | 2732250688 |
| 16 | 4529267712 |
| 17 | 7292346816 |
| 18 | 11438236320 |
| 19 | 17528382400 |
| 20 | 26300206624 |